Give reasons for 5 stars! Animals living in both air and water exist in a fluid
ID: 49777 • Letter: G
Question
Give reasons for 5 stars!
Animals living in both air and water exist in a fluid medium, where motion of the fluid is a characteristic property of the environment. Blue crabs have maximum sensory detection when facing current, as shown in the left crab photo below, however, crab orientation to flow also affects the hydrodynamic forces they experience. The graph on the right shows the drag acting on crabs placed at different angles to the flow (y = -0.007x + 1.1; r2 = 0.84; p < 0.001). Answer the following questions:
9. When a crab is facing directly into the current (maximizing its ability to detect incoming odors), what is the associated drag value?
A) 0
B) 0.5
C) 1.1
D) 90
10 An increase in crab angle of 10 degrees would have which of the following effects?
A) increase drag by 0.007 units
B) increase drag by 0.07 units
C) decrease drag by 0.007 units
D) decrease drag by 0.07 units
11. Do these data provide evidence for a hydrodynamic trade-off between prey detection and drag in blue crabs?
A) no; crab angle is positively related to drag
B) no; crab angle is negatively related to drag
C) yes; crab angle is positively related to drag
D) yes; crab angle is negatively related to drag
Explanation / Answer
9. B) 0.5
Frontal orientation is at 90o so when directly facing current drag value will be 0.5
10. D) decrease drag by 0.07 units
Increasing crab angle correspond to decreasing drag in the graph
11. B) no; crab angle is negatively related to drag
No information regarding prey detection is given.
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